Method and apparatus for indicating deactivation of semi-persistent scheduling

ABSTRACT

A method and apparatus for performing semi-persistent scheduling (SPS) deactivation in a wireless mobile communication system are disclosed. A base station (BS) transmits a downlink control channel to a user equipment (UE), and deactivates the SPS when a binary field indicating resource allocation information contained in the downlink control channel is entirely filled with ‘1’.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of co-pending application Ser. No.12/581,584 filed on Oct. 19, 2009, which claims the benefit of KoreanPatent Application No. 10-2009-0067796, filed on Jul. 24, 2009, and alsoclaims the benefit of U.S. Provisional Application Ser. No. 61/114,440,filed on Nov. 13, 2008 and 61/119,375, filed on Dec. 3, 2008, thecontents of which are hereby incorporated by reference herein in theirentirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wireless communication system, andmore particularly, to a method for scheduling radio resources forsemi-persistent uplink/downlink packet data transmission in a cellularwireless communication system, a structure of scheduling information, ascheme for transmitting the scheduling information, and an apparatususing the above-mentioned method and scheme as well as the schedulinginformation structure.

2. Discussion of the Related Art

A 3^(rd) Generation Partnership Project Long Term Evolution (3GPP LTE)communication system (hereinafter referred to as an “LTE system” forconvenience of description) will hereinafter be described as an exampleof a mobile communication system applicable to the present invention.

A frame structure for use in the LTE system will hereinafter bedescribed. The 3GPP LTE system supports a type 1 radio frame structureapplicable to frequency division duplex (FDD), and a type 2 radio framestructure applicable to time division duplex (TDD).

FIG. 1 shows a structure of a type 1 radio frame used in the LTE system.The type 1 radio frame includes 10 subframes, each of which consists oftwo slots. A time length of each constituent unit is shown in FIG. 1.

FIG. 2 shows a structure of a type 2 radio frame used in the LTE system.The type 2 radio frame includes two half-frames, each of which iscomposed of five subframes, a downlink piloting time slot (DwPTS), aguard period (GP), and an uplink piloting time slot (UpPTS), in whichone subframe consists of two slots. That is, one subframe is composed oftwo slots irrespective of the radio frame type. A time length of eachconstituent unit is shown in FIG. 2.

A resource grid structure for use in the LTE system will hereinafter bedescribed in detail.

FIG. 3 shows an uplink (UL) time-frequency resource grid structure foruse in the 3GPP LTE system.

Referring to FIG. 3, an uplink signal transmitted from each slot can bedescribed by a resource grid including N_(RB) ^(UL) N_(SC) ^(RB)subcarriers and N_(symb) ^(UL) Single Carrier-Frequency DivisionMultiple Access (SC-FDMA) symbols. Here, N_(RB) ^(UL) represents thenumber of resource blocks (RBs) in an uplink, N_(SC) ^(RB) representsthe number of subcarriers constituting one RB, and N_(symb) ^(UL)represents the number of SC-FDMA symbols in one uplink slot. N_(RB)^(UL) varies with an uplink transmission bandwidth constructed in acell, and must satisfy N_(RB) ^(min,UL)≦N_(RB) ^(UL)≦N_(RB) ^(max,UL).Here, N_(RB) ^(min,UL) is the smallest uplink bandwidth supported by thewireless communication system, and N_(RB) ^(max,UL) is the largestuplink bandwidth supported by the wireless communication system.Although N_(RB) ^(min, UL) may be set to 6 (N_(RB) ^(min,UL)=6) andN_(RB) ^(max,UL) may be set to 110 (N_(RB) ^(max,UL)=110) the scopes ofN_(RB) ^(min, UL) and N_(RB) ^(max,UL) are not limited thereto. Thenumber of SC-FDMA symbols contained in one slot may be differentlydefined according to the length of a Cyclic Prefix (CP) and the spacingbetween subcarriers.

Each element contained in the resource grid is called a resource element(RE), and can be identified by an index pair (k,l) contained in a slot,where k is an index in a frequency domain and is set to any one of 0, .. . , N_(RB) ^(UL)N_(sc) ^(RB)−1, and l is an index in a time domain andis set to any one of 0, . . . , N_(symb) ^(UL)−1.

A Physical Resource Block (PRB) is defined by N_(symb) ^(UL) consecutiveSC-FDMA symbols in a time domain and N_(SC) ^(RB) consecutivesubcarriers in a frequency domain. N_(symb) ^(UL) and N_(SC) ^(RB) maybe predetermined values, respectively. Therefore, one PRB in an uplinkmay be composed of N_(symb) ^(UL)×N_(SC) ^(RB) resource elements. Inaddition, one PRB may correspond to one slot in a time domain and 180kHz in a frequency domain. A PRB number n_(PRB) and a resource elementindex (k,l) in a slot can satisfy a predetermined relationship denotedby

$n_{PRB} = {\left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor.}$

FIG. 4 shows a downlink (DL) time-frequency resource grid structure foruse in the LTE system.

Referring to FIG. 4, a downlink signal transmitted from each slot can bedescribed by a resource grid including N_(RB) ^(DL) N_(SC) ^(RB)subcarriers and N_(symb) ^(DL) OFDM symbols. Here, N_(RB) ^(DL)represents the number of resource blocks (RBs) in a downlink, N_(SC)^(RB) represents the number of subcarriers constituting one RB, andN_(symb) ^(DL) represents the number of OFDM symbols in one downlinkslot. N_(RB) ^(DL) varies with an uplink transmission bandwidthconstructed in a cell, and must satisfy N_(RB) ^(min,DL)≦N_(RB)^(DL)≦N_(RB) ^(max,DL). Here, N_(RB) ^(min,DL) is the smallest uplinkbandwidth supported by the wireless communication system, and N_(RB)^(max,DL) is the largest uplink bandwidth supported by the wirelesscommunication system. Although N_(RB) ^(min, DL) may be set to 6 (N_(RB)^(min,DL)=6) and N_(RB) ^(max,DL) may be set to 110 (N_(RB)^(max,DL)=110), the scopes of N_(RB) ^(min, DL) and N_(RB) ^(max,DL) arenot limited thereto. The number of OFDM symbols contained in one slotmay be differently defined according to the length of a Cyclic Prefix(CP) and the subcarrier spacing. When transmitting data or informationvia multiple antennas, one resource grid for each antenna port may bedefined.

Each element contained in the resource grid is called a resource element(RE), and can be identified by an index pair (k,l) contained in a slot,where k is an index in a frequency domain and is set to any one of 0, .. . , N_(RB) ^(DL)N_(sc) ^(RB)−1, and l is an index in a time domain andis set to any one of 0, . . . , N_(symb) ^(DL)−1.

Resource blocks (RBs) shown in FIGS. 3 and 4 are used to describe amapping relationship between certain physical channels and resourceelements (REs). The RBs can be classified into physical resource blocks(PRBs) and virtual resource blocks (VRBs). Although the above mappingrelationship between the VRBs and the PRBs has been disclosed on adownlink basis, the same mapping relationship may also be applied to anuplink.

One PRB is defined by N_(symb) ^(DL) consecutive OFDM symbols in a timedomain and N_(SC) ^(RB) consecutive subcarriers in a frequency domain.N_(symb) ^(DL) and N_(SC) ^(RB) may be predetermined values,respectively. Therefore, one PRB may be composed of N_(symb)^(DL)×N_(SC) ^(RB) resource elements. One PRB may correspond to one slotin a time domain and may also correspond to 180 kHz in a frequencydomain, but it should be noted that the scope of the present inventionis not limited thereto.

The PRBs are assigned numbers from 0 to N_(RB) ^(DL)−1 in the frequencydomain. A PRB number n_(PRB) and a resource element index (k,l) in aslot can satisfy a predetermined relationship denoted by

$n_{PRB} = {\left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor.}$

The VRB may have the same size as that of the PRB. Two types of VRBs aredefined, the first one being a localized VRB (LVRB) and the second onebeing a distributed type (DVRB). For each VRB type, a pair of VRBs intwo slots of one subframe may assigned a single VRB number n_(VRB).

The VRB may have the same size as that of the PRB. Two types of VRBs aredefined, the first one being a localized VRB (LVRB) and the second onebeing a distributed VRB (DVRB). For each VRB type, a pair of PRBs mayhave a single VRB index (which may hereinafter be referred to as a ‘VRBnumber’) and are allocated over two slots of one subframe. In otherwords, N_(RB) ^(DL) VRBs belonging to a first one of two slotsconstituting one subframe are each assigned any one index of 0 to N_(RB)^(DB)−1 and N_(RB) ^(DL) VRBs belonging to a second one of the two slotsare likewise each assigned any one index of 0 to N_(RB) ^(DL)−1.

In the LTE system based on an Orthogonal Frequency Division MultipleAccess (OFDMA) scheme, a resource area in which each UE is able totransmit or receive data to and from a base station (BS) is allocatedfrom the BS to the UE. In this case, not only a time resource but also afrequency resource must be simultaneously allocated to the UE so as tocomplete resource allocation.

The so-called non-persistent scheduling method can simultaneouslyindicate time-frequency resource domains allocated to the UE. Therefore,if there is a need for the UE to use resources for a long period oftime, it must repeatedly perform signaling for resource allocation, sothat signaling overhead may be considerably generated.

In contrast, the so-called semi-persistent scheduling method firstallocates a time resource to a UE. In this case, the semi-persistentscheduling method may allow the time resource allocated to a specific UEto have periodicity. Then, the semi-persistent scheduling methodallocates a frequency resource to the UE when necessary to completetime-frequency resource allocation. The above-mentioned frequencyresource allocation may be referred to as ‘activation’. When using thesemi-persistent scheduling method, resource allocation can be maintainedfor a predetermined period by only one signaling process, so thatresources need not be repeatedly allocated, resulting in reduction insignaling overhead. Thereafter, if the necessity of performing resourceallocation for a UE disappears, a base station can transmit a signalingmessage for releasing the frequency resource allocation to the UE. Inthis way, the above-mentioned release of the frequency resource domainmay be referred to as ‘deactivation’. In this case, it is preferablethat the signaling overhead needed for the deactivation be reduced.

SUMMARY OF THE INVENTION

An object of the present invention devised to solve the problem lies ina method and apparatus for informing a UE of SPS deactivation withoutadding a new bit field or a new control channel format in acommunication system for allocating resources using a compact scheme.

The object of the present invention can be achieved by providing amethod for releasing resource allocation in a wireless mobilecommunication system, the method including receiving, by a userequipment (UE), a downlink control channel including resource allocationinformation, and releasing resource allocation for the UE when a binaryfield indicating the resource allocation information is entirely filledwith ‘1’.

In another aspect of the present invention, there is provided a methodfor transmitting a signal for releasing resource allocation in awireless mobile communication system, the method including fills, by abase station (BS), a binary field indicating resource allocationinformation contained in a downlink control channel with ‘1’, andtransmitting the downlink control channel to a user equipment (UE),wherein the binary field entirely filled with the value of ‘1’ indicatesa release of resources allocated to the UE.

In another aspect of the present invention, there is provided a methodfor deactivating semi-persistent scheduling (SPS) in a wireless mobilecommunication system including receiving, by a user equipment (UE), adownlink control channel, and deactivating the semi-persistentscheduling (SPS) when a binary field indicating resource allocationinformation contained in the downlink control channel is entirely filledwith ‘1’.

In another aspect of the present invention, there is provided a methodfor transmitting a signal for semi-persistent scheduling (SPS)deactivation in a wireless mobile communication system, the methodincluding filling, by a base station (BS), a binary field indicatingresource allocation information contained in a downlink control channelwith ‘1’, and transmitting the downlink control channel, wherein thebinary field entirely filled with the value of ‘1’ indicates the SPSdeactivation.

In another aspect of the present invention, there is provided anapparatus capable of using a semi-persistent scheduling (SPS). Theapparatus includes a radio frequency (RF) unit, and a processorelectrically connected to the RF unit, wherein the processor isconfigured to receive a downlink control channel through the RF unit,and to perform the SPS deactivation when a binary field indicatingresource allocation information contained in the downlink controlchannel is entirely filled with ‘1’.

In another aspect of the present invention, there is provided anapparatus capable of using a semi-persistent scheduling (SPS). Theapparatus includes a radio frequency (RF) unit, and a processorelectrically connected to the RF unit. The processor is configured tofill the entirety of a binary field indicating resource allocationinformation contained in a downlink control channel with ‘1’ during theSPS deactivation, and to transmit the downlink control channel with theRF unit. The binary field entirely filled with ‘1’ indicates the SPSdeactivation.

In another aspect of the present invention, there is provided a userequipment (UE) for a wireless mobile communication system, the userequipment (UE) including a radio frequency (RF) unit, and a processorelectrically connected to the RF unit, wherein the processor isconfigured to receive a downlink control channel including resourceallocation information through the RF unit, and to release resourceallocation for the UE when a binary field indicating the resourceallocation information is entirely filled with ‘1’.

In another aspect of the present invention, there is provided a wirelesscommunication apparatus including a radio frequency (RF) unit, and aprocessor electrically connected to the RF unit, wherein the processoris configured to fill the entirety of a binary field indicating resourceallocation information contained in a downlink control channel with ‘1’,and to transmit the downlink control channel to a user equipment (UE),the binary field being entirely filled with the value of ‘1’ indicates arelease of resources allocated to the UE.

The downlink control channel may be a physical downlink control channel(PDCCH).

A downlink control information (DCI) format of the downlink controlchannel may be a ‘format 0’ or a ‘format 1A’.

The wireless mobile communication system may use a scheduling based on acompact scheme, and the binary field may be composed of a fieldindicating a resource indication value (RIV).

The wireless mobile communication system may use a scheduling based on acompact scheme, and the binary field may be composed of a fieldindicating a resource indication value (RIV) and a field indicating‘Gap’ information used for distributed allocation of resources.

The wireless mobile communication system may use a scheduling based on acompact scheme, and the binary field may be composed of a fieldindicating a resource indication value (RIV) and a field indicatinghopping information.

The resource allocation information may be composed of resource blockallocation information, or may be composed of resource block allocationinformation and hopping resource allocation information.

The resource block allocation information may be represented by the RIV.The RIV may indicate a pair of a start index (S) and a length (L) ofconsecutive VRBs capable of being combined with each other.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention, illustrate embodiments of the inventionand together with the description serve to explain the principle of theinvention.

In the drawings:

FIG. 1 shows a structure of a frequency division duplex (FDD) type radioframe used in an LTE system.

FIG. 2 shows a structure of a time division duplex (TDD) type radioframe used in an LTE system.

FIG. 3 shows an uplink (UL) resource grid structure for use in an LTEsystem.

FIG. 4 shows a downlink (DL) resource grid structure for use in an LTEsystem.

FIG. 5 is a block diagram illustrating an Evolved Universal MobileTelecommunications System (E-UMTS) network structure as an example of amobile communication system.

FIGS. 6 and 7 illustrate radio interface protocol structures between aUE and a UMTS Terrestrial Radio Access Network (UTRAN) that are based ona 3GPP LTE radio access network standard.

FIG. 8 shows physical channels used for an LTE system and a generalsignal transmission method capable of using the physical channels.

FIG. 9 is a conceptual diagram illustrating signal processing forenabling a UE to transmit an uplink signal.

FIG. 10 is a conceptual diagram illustrating signal processing forenabling a base station (BS) to transmit a downlink signal.

FIG. 11 is a conceptual diagram illustrating an SC-FDMA scheme fortransmitting an uplink signal and an OFDMA scheme for transmitting adownlink signal in a mobile communication system.

FIG. 12 is a view illustrating an example of a method for mappingdistributed virtual resource blocks (DVRBs) and localized virtualresource blocks (LVRBs) to physical resource blocks (PRBs).

FIG. 13 is a view illustrating an example of a method for allocatingresource blocks (RBs) by a compact scheme.

FIG. 14 is a view illustrating an example of a method for mapping twoDVRBs having consecutive indexes to a plurality of contiguous PRBs.

FIG. 15 is a view illustrating an example of a method for mapping twoDVRBs having consecutive indexes to a plurality of spaced PRBs.

FIG. 16 is a view illustrating an example of RIVs when the number ofavailable RBs is 20 according to one embodiment of the presentinvention.

FIG. 17 shows an exemplary structure of a PDCCH field for signaling SPSdeactivation according to the present invention.

FIG. 18 shows individual fields acquired when DVRB allocation is carriedout in a PDCCH having a ‘DCI format 1A’ according to the presentinvention.

FIG. 19 shows individual fields of a PDCCH having a ‘DCI format 0’according to the present invention.

FIG. 20 is a block diagram illustrating constituent elements of a deviceapplicable to the present invention.

FIG. 21 is a flowchart illustrating a method for deactivating asemi-persistent scheduling (SPS) according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention with reference to the accompanying drawings. Thedetailed description, which will be given below with reference to theaccompanying drawings, is intended to explain exemplary embodiments ofthe present invention, rather than to show the only embodiments that canbe implemented according to the invention.

The following detailed description includes specific details in order toprovide a thorough understanding of the present invention. However, itwill be apparent to those skilled in the art that the present inventionmay be practiced without such specific details. For example, thefollowing description will be given centering upon a mobilecommunication system serving as an LTE system, but the present inventionis not limited thereto and the remaining parts of the present inventionother than unique characteristics of the LTE system are applicable toother mobile communication systems.

In some cases, in order to prevent ambiguity of the concepts of thepresent invention, conventional devices or apparatuses well known tothose skilled in the art will be omitted and be denoted in the form of ablock diagram on the basis of the important functions of the presentinvention. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts.

In the following description, a terminal may include mobile or fixeduser equipments (UEs), for example, a user equipment (UE), a mobilestation (MS) and the like, and may also be referred to in any of theseways as necessary. Also, the base station (BS) may be any of nodesincluded in a network communicating with the UE, for example, a Node B(Node-B) and an eNode B (eNode-B), and may also be referred to in any ofthese ways.

In a mobile communication system, a UE can receive information from abase station (BS) via a downlink, and the UE can also transmitinformation via an uplink. Information transferred from—or receivedby—the UE may be data, other control information, and the like, andthere are a variety of physical channels according to types and usagesof this information transferred or received from or in the UE.

FIG. 5 shows an Evolved Universal Mobile Telecommunications System(E-UMTS) network structure serving as an example of a mobilecommunication system.

The E-UMTS system is an evolved version of the conventional UniversalMobile Telecommunications System (UMTS) system and basic standardizationthereof is in progress under the 3rd Generation Partnership Project(3GPP). Generally, the E-UMTS is also referred to as a Long TermEvolution (LTE) system.

The E-UMTS network may be classified into an Evolved-UMTS TerrestrialRadio Access Network (E-UTRAN) 501 and a Core Network (CN) 502. TheE-UTRAN includes a UE 503, a BS (eNB or eNode B) 504, and an AccessGateway (AG) 505 which is located at an end of a network and isconnected to an external network. The AG 505 can be divided into a partthat handles processing of user traffic and a part that handles controltraffic. Here, the AG part 505 for processing new user traffic and theAG part for processing control traffic can communicate with each otherusing a new interface.

One or more cells may exist for one eNB. An interface for transmittinguser traffic or control traffic can be used between eNBs. A Core Network(CN) 502 may include the AG 505 and a node or the like for userregistration of the UE 503. An interface for discriminating between theE-UTRAN 501 and the CN 502 may be used.

Radio interface protocol layers between the UE and the network can beclassified into an L1 layer (first layer), an L2 layer (second layer)and an L3 layer (third layer) on the basis of the lower three layers ofthe Open System Interconnection (OSI) reference model widely known incommunication systems. A physical layer belonging to the L1 layerprovides an information transfer service utilizing a physical channel. ARadio Resource Control (RRC) layer located at the L3 layer controlsradio resources between the UE and the network. For this operation, RRCmessages are exchanged between the UE and the network via the RRClayers. The RRC layers may be distributed among base stations (BSs) 504and network nodes, or may be located only at a base station (BSs) 504 orthe AG 505.

FIGS. 6 and 7 illustrate radio interface protocol structures between aUE and a UTRAN that are based on a 3GPP LTE radio access networkstandard.

The radio interface protocol of FIG. 6 or FIG. 7 is divided horizontallyinto a physical layer, a data link layer and a network layer, andvertically into a user plane for transmitting data information and acontrol plane for transmitting a control signal such as a signalingmessage. In more detail, FIG. 6 shows individual layers of a radioprotocol control plane and FIG. 7 shows individual layers of a radioprotocol user plane. Protocol layers of FIGS. 6 and 7 can be classifiedinto an L1 layer (first layer), an L2 layer (second layer) and an L3layer (third layer) on the basis of the lower three layers of the OSIreference model widely known in communication systems.

The following is a detailed description of respective layers of theradio protocol control plane of FIG. 6 and the radio protocol user planeof FIG. 7.

The physical layer, which is the first layer, provides an informationtransfer service to an upper layer using a physical channel. Thephysical layer (PHY) is connected to a Medium Access Control (MAC)layer, located above the physical layer, through a transport channel.Data is transferred between the MAC layer and the physical layer throughthe transport channel. In this case, the transport channel is classifiedinto a dedicated transport channel and a common transport channelaccording to whether or not a channel is shared. Data transfer betweendifferent physical layers, specifically between the respective physicallayers of a transmitter and a receiver, is performed through thephysical channel.

A variety of layers exist in the second layer (L2 layer). The MAC layermaps various logical channels to various transport channels, andperforms logical-channel multiplexing for mapping various logicalchannels to one transport channel. The MAC layer is connected to the RLClayer serving as an upper layer through a logical channel. The logicalchannel can be classified into a control channel for transmittinginformation of a control plane and a traffic channel for transmittinginformation of a user plane according to categories of transmissioninformation.

The RLC layer of the second layer performs segmentation andconcatenation on data received from an upper layer, and adjusts the sizeof data to be suitable for a lower layer transmitting data to a radiointerval. In order to guarantee various Qualities of Service (QoSs)requested by respective radio bearers (RBs), three operation modes,i.e., a Transparent Mode (TM), an Unacknowledged Mode (UM), and anAcknowledged Mode (AM), are provided. Specifically, an AM RLC performs aretransmission function using an Automatic Repeat and Request (ARQ)function so as to implement reliable data transmission.

A Packet Data Convergence Protocol (PDCP) layer of the second layer (L2)performs a header compression function to reduce the size of an IPpacket header having relatively large and unnecessary controlinformation in order to efficiently transmit IP packets such as IPv4 orIPv6 packets in a radio interval with a narrow bandwidth. As a result,only information required for a header part of data can be transmitted,so that transmission efficiency of the radio interval can be increased.In addition, in the LTE system, the PDCP layer performs a securityfunction, this security function is composed of a ciphering function forpreventing a third party from eavesdropping on data and an integrityprotection function for preventing a third party from handling data.

A Radio Resource Control (RRC) layer located at the top of the thirdlayer (L3) is defined only in the control plane and is responsible forcontrol of logical, transport, and physical channels in association withconfiguration, re-configuration and release of Radio Bearers (RBs). TheRB is a logical path that the first and second layers (L1 and L2)provide for data communication between the UE and the UTRAN. Generally,Radio Bearer (RB) configuration means that a radio protocol layer neededfor providing a specific service, and channel characteristics aredefined and their detailed parameters and operation methods areconfigured. The Radio Bearer (RB) is classified into a Signaling RB(SRB) and a Data RB (DRB). The SRB is used as a transmission passage ofRRC messages in the C-plane, and the DRB is used as a transmissionpassage of user data in the U-plane.

A downlink transport channel for transmitting data from the network tothe UE may be classified into a Broadcast Channel (BCH) for transmittingsystem information and a downlink Shared Channel (SCH) for transmittinguser traffic or control messages. Traffic or control messages of adownlink multicast or broadcast service may be transmitted through adownlink SCH and may also be transmitted through a downlink multicastchannel (MCH). Uplink transport channels for transmission of data fromthe UE to the network include a Random Access Channel (RACH) fortransmission of initial control messages and an uplink SCH fortransmission of user traffic or control messages.

Downlink physical channels for transmitting information transferred to adownlink transport channel to a radio interval between the UE and thenetwork are classified into a Physical Broadcast Channel (PBCH) fortransmitting BCH information, a Physical Multicast Channel (PMCH) fortransmitting MCH information, a Physical Downlink Shared Channel (PDSCH)for transmitting downlink SCH information, and a Physical DownlinkControl Channel (PUCCH) (also called a DL L1/L2 control channel) fortransmitting control information, such as DL/UL Scheduling Grantinformation, received from first and second layers (L1 and L2). In themeantime, uplink physical channels for transmitting informationtransferred to an uplink transport channel to a radio interval betweenthe UE and the network are classified into a Physical Uplink SharedChannel (PUSCH) for transmitting uplink SCH information, a PhysicalRandom Access Channel for transmitting RACH information, and a PhysicalUplink Control Channel (PUCCH) for transmitting control information,such as HARQ ACK or NACK Scheduling Request (SR) and Channel QualityIndicator (CQI) report information, received from first and secondlayers (L1 and L2).

FIG. 8 shows physical channels used for a 3GPP LTE system serving as anexample of a mobile communication system and a general signaltransmission method capable of using the physical channels.

If a UE is re-powered on after being powered off or newly enters a cellregion, the UE performs an initial cell search process, such assynchronization with a base station (BS), at step S801. For the initialcell search process, the UE receives information of a PrimarySynchronization Channel (P-SCH) and information of a SecondarySynchronization Channel (S-SCH) from the base station (BS), issynchronized with the BS, and is able to acquire information such as acell ID or the like from the BS. After that, the UE receives informationof a physical broadcast channel from the BS, such that it can acquireinter-cell broadcast information from the BS. In the meantime, the UEreceives a downlink reference signal (DL RS) at the initial cellsearching step, so that it can recognize a downlink channel status.

After performing the initial cell search process, the UE receivesinformation of a Physical Downlink Control Channel (PDCCH) andinformation of a Physical Downlink Shared Control Channel (PDSCH) basedon the PDCCH information, so that it can acquire more detailed systeminformation at step S802.

In the meantime, if a UE initially accesses the BS or has no resourcesfor uplink transmission, the UE can perform a Random Access Procedure(RAP), such as steps S803 to S806, for the BS. For this operation, theUE transmits a specific sequence as a preamble through a Physical RandomAccess Channel (PRACH) at step S803, and receives a response message tothe random access through a PDCCH and a PDSCH at step S804. In case of acompetitive-based random access except for a handover case, a contentionresolution procedure such as step S805 or S806 can then be carried out.At step S805, information is transmitted through an additional PRACH. Atstep S806, PDCCH/PDSCH information is received.

After performing the above-mentioned steps, as a procedure fortransmitting UL/DL signals, the UE receives information of a PDCCH and aPDCCH at step S807, and transmits information through a Physical UplinkShared Channel (PUSCH) and a Physical Uplink Control Channel (PUCCH) atstep S808.

In the LTE system, a signaling process for transmitting UL/DL signals isas follows.

FIG. 9 is a conceptual diagram illustrating signal processing forenabling a UE to transmit an uplink (UL) signal.

In order to transmit a UL signal, a scrambling module 901 of the UE canscramble a transmission signal using a specific scrambling signal of theUE. The scrambled signal is input to a modulation mapper 902, and isconverted into a complex symbol using a BPSK (Binary Phase ShiftKeying)-, QPSK (Quadrature Phase Shift Keying)-, or 16 QAM (QuadratureAmplitude Modulation)-scheme according to categories of the transmissionsignal and/or a channel status. After that, the modulated complex symbolis processed by a transform precoder 903, and is then input to theresource element mapper 904. The resource element mapper 904 is able tomap a complex symbol to a time-frequency element to be used for actualtransmission. The processed signal may be transmitted to the basestation (BS) via the SC-FDMA signal generator 905.

FIG. 10 is a conceptual diagram illustrating signal processing forenabling the base station (BS) to transmit a downlink signal.

In the LTE system, the BS is able to transmit one or more codewords viaa downlink. Therefore, one or more codewords may be processed as complexsymbols by the scrambling module 1001 and the modulation mapper 1002 inthe same manner as in the uplink case of FIG. 10. Thereafter, thecomplex symbols are mapped to a plurality of layers by the layer mapper1003, and each layer may be multiplied by a predetermined precodingmatrix selected depending on a channel status and may then be allocatedto each transmission antenna by the precoding module 1004. The processedtransmission signal for each antenna is mapped to a time-frequencyresource element to be used for transmission by the resource elementmapper 1005. After that, the mapped result can be transmitted via eachantenna after passing through the Orthogonal Frequency Division MultipleAccess (OFDMA) signal generator 1006.

In the case where a UE for use in a mobile communication systemtransmits an uplink signal, a Peak to Average Power Ratio (PAPR) maybecome more serious than in the case where the BS transmits a downlinksignal. Thus, as described in FIGS. 9 and 10, the SC-FDMA scheme is usedfor uplink signal transmission in a different way from the OFDMA schemeused for downlink signal transmission.

In the LTE system, the SC-FDMA scheme for uplink signal transmission andthe OFDMA scheme for downlink signal transmission will hereinafter bedescribed in detail.

FIG. 11 is a conceptual diagram illustrating the SC-FDMA scheme foruplink signal transmission and the OFDMA scheme for downlink signaltransmission in a mobile communication system.

Referring to FIG. 11, not only a UE for transmitting an uplink signalbut also a base station (BS) for transmitting a downlink signal includesa Serial-to-Parallel converter 1101, a subcarrier mapper 1103, anM-point IDFT module 1104, a Parallel-to-Serial converter 1105, and thelike. However, a UE for transmitting a signal using the SC-FDMA schemefurther includes an N-point DFT module 1102, and compensates for apredetermined part of the IDFT processing influence of the M-point IDFTmodule 1104 so that a transmission signal can have single carriercharacteristics.

In a cellular orthogonal frequency division multiplex (OFDM) wirelesspacket communication system, uplink/downlink (UL/DL) data packettransmission is made on a subframe basis and one subframe is defined bya certain time interval including a plurality of OFDM symbols.Hereinafter, terms used in the detailed description of this applicationare defined as follows.

A ‘resource element (RE)’ represents a smallest frequency-time unit inwhich data or a modulated symbol of a control channel is mapped.Provided that a signal is transmitted in one OFDM symbol over Msubcarriers and N OFDM symbols are transmitted in one subframe, M×N REsare present in one subframe.

A ‘physical resource block (PRB)’ represents a unit frequency-timeresource for data transmission. In general, one PRB includes a pluralityof consecutive REs in a frequency-time domain, and a plurality of PRBsis defined in one subframe.

A ‘virtual resource block (VRB)’ represents a virtual unit resource fordata transmission. In general, the number of REs included in one VRB isequal to the length of REs included in one PRB, and, when data istransmitted, one VRB can be mapped to one PRB or some areas of aplurality of PRBs.

A ‘localized virtual resource block (LVRB)’ is one type of the VRB. OneLVRB is mapped to one PRB. LVRBs having different logical indexes aremapped to PRBs having different physical indexes. An LVRB may beinterpreted in the same as a PRB.

A ‘distributed virtual resource block (DVRB)’ is another type of VRB.One DVRB is mapped to some REs in a plurality of PRBs, and REs to whichdifferent DVRBs are mapped are not duplicated.

‘N_(D)’=‘N_(d)’ represents the number of PRBs to which one DVRB ismapped. FIG. 12 illustrates an example of a method for mapping DVRBs andLVRBs to PRBs. In FIG. 12, N_(D)=3. As can be seen from FIG. 12, anarbitrary DVRB can be divided into three parts and the divided parts canbe mapped to different PRBs, respectively. At this time, the remainingpart of each PRB, not mapped by the arbitrary DVRB, is mapped to adivided part of another DVRB. The LTE system has a system structuredenoted by ‘N_(D)’=‘N_(d)’=2.

Semi-Persistent Scheduling (SPS) is a scheduling scheme for allocatingresources to a specific UE such that the allocated resources can bepersistently maintained during a specific time interval. In the casewhere a predetermined amount of data is transmitted during a specifictime in the same manner as in a Voice over Internet Protocol (VoIP),control information need not be transmitted to each data transmissioninterval for resource allocation, such that an amount of wasted controlinformation can be reduced by the SPS scheme.

‘N_(PRB)’ represents the number of PRBs in a system.

‘N_(LVRB)’ represents the number of LVRBs available in the system.

‘N_(DVRB)’ represents the number of DVRBs available in the system.

‘N_(LVRB) _(—) _(UE)’ represents the maximum number of LVRBs allocableto one user equipment (UE).

‘N_(DVRB) _(—) _(UE)’ represents the maximum number of DVRBs allocableto one UE.

‘N_(subset)’ represents the number of subsets.

‘N_(F-Block)’ represents the number of frequency bands used in a systemcapable of using a plurality of frequency bands.

Here, the “number of RBs” means the number of RBs classified on afrequency axis. That is, even in the case where RBs can be classified byslots constituting a subframe, the “number of RBs” means the number ofRBs classified on the frequency axis of the same slot.

FIG. 12 shows an example of definitions of LVRBs and DVRBs.

As can be seen from FIG. 12, each RE of one LVRB is mapped one-to-one toeach RE of one PRB. For example, one LVRB is mapped to a PRB0 (1201). Incontrast, one DVRB is divided into three parts and the divided parts aremapped to different PRBs, respectively. For example, a DVRB0 is dividedinto three parts and the divided parts are mapped to a PRB1, PRB4 andPRB6, respectively. Likewise, a DVRB1 and a DVRB2 are each divided intothree parts and the divided parts are mapped to the remaining resourcesof the PRB1, PRB4 and PRB6. Although each DVRB is divided into threeparts in this example, the present invention is not limited thereto. Forexample, each DVRB may be divided into two parts.

Downlink data transmission from a base station (BS) to a specificterminal (i.e., a specific UE) or uplink data transmission from thespecific UE to the base station (BS) is performed through one or moreVRBs in one subframe. In other words, the above-mentioned datatransmission may be achieved through PRBs corresponding to one or moreVRBs. When the base station (BS) transmits data to the specific UE, ithas to notify the terminal of which VRB will be used for datatransmission. Also, in order to enable the specific UE to transmit data,the base station (BS) has to notify the terminal of which VRB will beused for data transmission. Specific information indicating how to mapVRBs to PRBs can be predetermined, so that the UE can automaticallyrecognize which PRB will be searched when acquiring information of VRBsallocated to the UE itself.

Data transmission schemes can be broadly classified into a frequencydiversity scheduling (FDS) scheme and a frequency selective scheduling(FSS) scheme. The FDS scheme is a scheme that obtains a receptionperformance gain through frequency diversity, and the FSS scheme is ascheme that obtains a reception performance gain through frequencyselective scheduling.

In the FDS scheme, a transmission stage transmits one data packet oversubcarriers widely distributed in a system frequency domain so thatsymbols in the data packet can experience various radio channel fadings.Therefore, an improvement in reception performance is obtained bypreventing the entire data packet from being subject to unfavorablefading. In contrast, in the FSS scheme, an improvement in receptionperformance is obtained by transmitting the data packet over one or moreconsecutive frequency areas in the system frequency domain which are ina favorable fading state. In a cellular OFDM wireless packetcommunication system, a plurality of terminals is present in one cell.At this time, because the radio channel conditions of the respectiveterminals have different characteristics, it is necessary to performdata transmission using the FDS scheme with respect to a certain UE anddata transmission using the FSS scheme with respect to a different UEeven within one subframe. As a result, a detailed FDS transmissionscheme and a detailed FSS transmission scheme must be designed such thatthe two schemes can be efficiently multiplexed within one subframe. Onthe other hand, in the FSS scheme, a gain can be obtained by selectivelyusing a band favorable to a UE among all available bands. In contrast,in the FDS scheme, a comparison is not made as to whether a specificband is good or bad, and, as long as a frequency interval capable ofadequately obtaining diversity is maintained, there is no need to selectand transmit a specific frequency band. Accordingly, it is advantageousin terms of improvement in overall system performance to perform thefrequency selective scheduling of the FSS scheme preferentially whenscheduling.

In the FSS scheme, because data is transmitted using subcarriersconsecutively contiguous in the frequency domain, it is preferable thatthe data be transmitted using LVRBs. At this time, provided that N_(PRB)PRBs are present in one subframe and a maximum of N_(LVRB) LVRBs areavailable within the system, the base station can transmit bitmapinformation of N_(LVRB) bits to each terminal to notify the terminalthrough which one of the LVRBs downlink data will be transmitted orthrough which one of the LVRBs uplink data can be transmitted. That is,each bit of the N_(LVRB)-bit bitmap information, which is transmitted toeach terminal as scheduling information, indicates whether data will orcan be transmitted through an LVRB corresponding to this bit, among theN_(LVRB) LVRBs. This scheme is disadvantageous in that, when the numberN_(LVRB) becomes larger, the number of bits to be transmitted to eachterminal becomes larger in proportion thereto.

In the meantime, physical downlink control channel (PDCCH) downlinkcontrol information (DCI) transferred to a UE may have a plurality offormats. A resource allocation field transferred over the PDCCH may havedifferent structures according to Downlink Control Information (DCI)formats. Thus, the user equipment (UE) may interpret the resourceallocation field according to a format of the received DCI.

The resource allocation field may have two parts, i.e., resource blockallocation information and a resource allocation header field. Aplurality of resource allocation types may be defined. For example,according to a first resource allocation type, the resource blockallocation information may have a bitmap indicating one set ofconsecutive physical resource blocks (PRBs). In this case, one bit maybe allocated to one resource block group (RBG). According to a secondresource allocation type, resource block allocation information may havea bitmap indicating subsets or RBs allocated to the UE. According to athird resource allocation type, resource block allocation informationmay have a bitmap indicating consecutively allocated VRBs. At this time,the resource allocation field may include a resource indication value(RIV) indicating a start resource block and the length ofconsecutively-allocated resource blocks (RBs). Examples of theabove-mentioned resource allocation types have been disclosed in the3GPP TS 36.213 document.

For example, a DCI format 1A prescribed in 3GPP TS 36.213 may be usedfor compact scheduling of one physical downlink shared channel (PDSCH)codeword. This compact scheduling is a scheduling scheme for allocatingone set of consecutive VRBs to a UE, and corresponds to the above thirdresource allocation type. Hereinafter, the above-mentioned compactscheduling in the present invention may be referred to as a compactscheme.

As described above, provided that a terminal (i.e., the UE) may beassigned only one set of contiguous RBs, information of the assigned RBsmay be represented by the compact scheme denoted by both a start pointof RBs and the number of the RBs.

FIG. 13 is a view illustrating an example of a method for allocatingresource blocks by a compact scheme. If the number of available RBs isdenoted by N_(RB)=N_(VRB), the length of available RBs varies dependingon respective start points as shown in FIG. 13, such that the number ofcombinations for RB allocation is N_(LVRB)(N_(LVRB)+1)/2. Accordingly,the number of bits required for the combinations is ‘ceiling(log2(N_(LVRB)(N_(LVRB)+1)/2))’. Here, ceiling(x) means rounding “x” up tothe nearest integer. This method is advantageous over the bitmap schemein that the number of bits does not significantly increase with theincrease in the number N_(LVRB).

On the other hand, for a method for notifying a UE of DVRB allocation,it is necessary to reserve the positions of respective divided parts ofDVRBs distributively transmitted for a diversity gain. Alternatively,additional information may be required to directly notify the positions.Preferably, provided that the number of bits for signaling for the DVRBsis set to be equal to the number of bits in LVRB transmission of theabove-stated compact scheme, it is possible to simplify a signaling bitformat in a downlink. As a result, there are advantages that the samechannel coding can be used, etc.

Here, in the case where one UE is allocated a plurality of DVRBs, thisUE is notified of a DVRB index of a start point of the DVRBs, a length(=the number of the allocated DVRBs), and a relative position differencebetween divided parts of each DVRB (e.g., a gap between the dividedparts). The LTE system is able to select either of ‘Gap1’ and ‘Gap2’,each of which has a predetermined value according to the number ofsystem resource blocks. Accordingly, a value of 1 bit may be separatelyallocated to indicate the selection of ‘Gap1’ or ‘Gap2’.

The following table 1 shows a structure of the ‘Gap’ which can be usedin the LTE system according to a system bandwidth. In the case where thenumber of available system resource blocks (system RBs) is less than 50,only the ‘Gap1’ (=1^(st) Gap) is used, so that there is no need toallocate one bit for ‘Gap’ indication. In contrast, in the case wherethe number of available system RBs is equal to or greater than 50,either one of ‘Gap1’ (=1^(st) Gap) and ‘Gap2’ (=2^(nd) Gap) must beused, so that signaling of 1 bit is needed to indicate which one of‘Gap1’(=1^(st) Gap) and ‘Gap2’(=2^(nd) Gap) is used.

TABLE 1 Gap (N_(gap)) System BW 1^(st) Gap 2^(nd) Gap (N_(RB) ^(DL))(N_(gap,1)) (N_(gap,2))  6-10 ┌N_(RB) ^(DL)/2┐ N/A 11 4 N/A 12-19 8 N/A20-26 12 N/A 27-44 18 N/A 45-49 27 N/A 50-63 27  9 64-79 32 16 80-110 4816

FIG. 14 illustrates an example of a method for mapping two DVRBs havingconsecutive indexes to a plurality of contiguous PRBs.

As shown in FIG. 14, in the case where a plurality of DVRBs havingconsecutive indexes are mapped to a plurality of contiguous PRBs, firstdivided parts 1401 and 1402 and second divided parts 1403 and 1404 arespaced apart from each other by a gap 1405, while divided partsbelonging to each of the upper divided parts and lower divided parts arecontiguous to each other, so that the diversity order becomes 2. In thiscase, frequency diversity can be obtained only by a gap. In FIG. 14,N_(D)=N_(d)=2.

FIG. 15 illustrates an example of a method for mapping two DVRBs havingconsecutive indexes to a plurality of spaced PRBs.

In the method of FIG. 15, DVRB indexes are constructed as shown in FIG.15. When mapping DVRBs to PRBs, consecutive DVRB indexes may bedistributed without being mapped to contiguous PRBs. For example, a DVRBindex ‘0’ and a DVRB index ‘1’ are not arranged contiguous to eachother. In other words, in FIG. 15, DVRB indexes are arranged in theorder of 0, 8, 16, 4, 12, 20, . . . , and this arrangement can beobtained by inputting the consecutive indexes to a block interleaver. Inthis case, it is possible to obtain distribution within each of thedivided parts 1501 and 1502, as well as distribution by a gap 1503.Therefore, when a UE is allocated two DVRBs as shown in FIG. 15, thediversity order increases to 4, resulting in an advantage that anadditional diversity gain can be obtained. In FIG. 15, N_(D)=N_(d)=2.

At this time, the value of the gap indicative of the relative positiondifference between the divided parts can be expressed in two ways.Firstly, the gap value can be expressed by a difference between DVRBindexes. Secondly, the gap value can be expressed by a differencebetween indexes of PRBs to which a DVRB is mapped. In the case of FIG.15, Gap=1 in the first way, while Gap=3 in the second way. FIG. 15 showsthe latter case 1503. Meanwhile, if the total number of RBs of thesystem is changed, the DVRB index arrangement may be changedaccordingly. In this case, the use of the second way has the advantageof recognizing a physical distance between the divided parts.

In order to perform signaling of DVRB allocation, the above-mentionedLVRB compact scheme may be used. That is, if the compact scheme isapplied to DVRBs signaled for one UE, PRBs mapped to the DVRBs may bedistributed in a physical frequency domain, but these DVRBs haveconsecutive logical indexes in a virtual region (i.e., a logicalregion). In this case, a start point of consecutively-allocated RBs andlength information of the RBs correspond to a start point of VRB indexesinstead of PRB indexes and length information thereof, respectively.

As described above, in the compact scheme, LVRB signaling includes astart point of RBs and length information of the RBs. In order toperform the DVRB signaling, gap information may be additionally requiredin some cases. In order to constantly maintain the number of bitsrequired for the entire signaling, there is a need to limit the lengthinformation such that an amount of information must be reduced. Forexample, when using 50 RBs or more, one bit of the RIV field must beassigned for ‘Gap’ indication, such that there is a need to reduce thenumber of bits required for transferring the RIV with the limitation inthe length information.

On the other hand, in case of using RBs to perform the common signalingfor several users, control signaling for notifying allocated RBs mustallow all users present in a cell to read information of the allocatedRBs. Thus, for this control signaling, a code rate may be reduced or atransmission power may be increased, such that the resultant controlsignaling information having a low code rate and a high transmissionpower may be transferred to several users. In order to reduce the coderate of the control signaling to which limited resources are allocated,an amount of control data must be reduced. In order to reduce the amountof control data, the number of bits required for RB allocationinformation must be reduced.

Likewise, control message data transferred to allocated RBs must allowall users present in the cell to read corresponding information, suchthat the control message data is transferred at a low code rate.Assuming that the code rate is 1/20, if an amount of data increases by16 bits, an amount of codeword made after channel coding increases by320 bits. In the Long Term Evolution (LTE), assuming that one TX antennatransmission (i.e., 1 Tx antenna transmission) is carried out and oneOFDM symbol is used for a control signal, the number of symbols capableof transferring payload data within one RB (i.e., 1RB) is 148. Thus,assuming that a quadrature phase shift keying (QPSK) modulation is used,the number of transferable bits is 296. As a result, data increases by16 bits, and data increases by 320 bits, such that two RBs areadditionally needed.

That is, in order to maintain a low code rate, although the size of dataincreases slightly, the number of RBS required for transferring thisdata greatly increases, such that RBs need to be allocated with agranularity of one RB unit (i.e., a 1RB-based granularity).

Hereinafter, a resource allocation signaling structure for establishinga step for limiting a start position with a granularity of one-RBallocation (i.e., 1RB allocation) will be described in detail.

The following equation 1 shows an exemplary signaling method based onthe compact scheme which notifies of a start point (S) of RBs and thenumber (=Length, L) of allocated RBs.

[Equation 1] if L − 1 ≦ └N_(RB)/2┘ then RIV = N_(RB)(L − 1) + S else RIV= N_(RB)(N_(RB) − L + 1) + (N_(RB) − 1 − S) End Required bits N_(bit)_(—) _(required) = ┌log₂(RIV_(max) + 1)┐ Without limitation RIV_(max) =N_(RB) · (N_(RB) + 1)/2 − 1 With limitation L^(Limit) RIV_(max) =min{N_(RB) · (N_(RB) + 1)/2 − 1, N_(RB) · (L^(Limit) − 1) + N_(RB) −L^(Limit)}

In the following description, “mod(x,y)” means “x mod y”, and “mod”means a modulo operation. Also, “└•┘” means a descending operation, andrepresents a largest one of integers equal to or smaller than a numeralindicated in “└ ┘”. On the other hand, “┌•┐” means an ascendingoperation, and represents a smallest one of integers equal to or largerthan a numeral indicated in “┌ ┐”. Also, “round(•)” represents aninteger nearest to a numeral indicated in “( )”. “min(x,y)” represents asmaller value selected between x and y, whereas “max(x,y)” represents alarger value selected between x and y.

Assuming that the total number of available RBs is denoted by N_(RB) andthe beginning number of indexes to be assigned to the RBs is set to 0,indexes from 0 to N_(RB)−1 are sequentially assigned to the RBs. In thiscase, N_(RB) may be the total number of all RBs contained in a systemband, the number of all RBs used as VRBs, or the number of RBs containedin any limited area.

Thus, the range of S may be 0≦S≦N_(RB)−1, and the range of allocable ‘L’values is changed according to this S value. In another view, the Lvalue is in the range of 1≦L≦N_(RB), and the range of available S valuesis changed according to the L value. Namely, a certain S value is unableto be combined with a specific L value.

A maximum value of each of the S and L values may be represented by abinary number irrespective of such impossible combinations. A bit fieldfor this binary number may be constructed for each of the S and Lvalues. In case of transmitting each of the bit fields, if N_(RB) is 20(i.e., N_(RB)=20), 20 is less than 2⁵ (i.e., 20<2⁵), so that 5 bits forthe S value and 5 bits for the L values, namely, a total of bits, areneeded. However, these 10 bits include information of uselesscombinations incapable of being actually generated, such that overheadof unnecessary transmission bits is generated. Thus, the number oftransmission bits can be reduced if each combination of generable S andL values is represented by ‘RIV’, this RIV is converted into a binarynumber according to binary representation, and the resultant RIV of thebinary number is then transferred.

FIG. 16 is a view illustrating an example of RIVs when N_(RB)=20.

As can be seen from FIG. 16, ‘RIV’ is decided according to S and Lvalues. In case of calculating ‘RIV’ related to 0≦S≦N_(RB)−1 in each ofall L values using Equation 1, RIVs of FIG. 16 are formed. The value ofeach element shown in FIG. 16 is ‘RIV’ indicating a combination of S andL values corresponding to the above element. Values contained in a leftupper part covering almost half of FIG. 16 correspond to combinations ofgenerable S and L values if N_(RB)=20, and values contained in a rightlower part colored in gray, covering the other half of FIG. 16,correspond to combinations of S and L values incapable of beinggenerated.

In this scheme, RIVs present in the gray-colored part under thecondition of L−1≦└N_(RB)/2┘, are mapped to RIVs under the othercondition of L−1>└N_(RB)/2┘, such that no RIVs are wasted. For example,if N_(RB) is set to 20 (i.e., N_(RB)=20), RIVs present in a specificpart corresponding to L<└N_(RB)/2┘+1=└20/2┘+1=11 among the right lowerpart of FIG. 12 are reused in another part corresponding toL>└N_(RB)/2┘+1=└20/2┘+1=11 among the left upper part of FIG. 20. In thiscase, a maximum value (i.e., a maximum RIV) among RIVs present in theleft upper end is 209.

In this scheme, the maximum RIV may influence the number of transmissionbits, RIVs below the maximum RIV may not be mapped to values incapableof being obtained by combinations of actual S and L values. That is, allvalues below the maximum RIV correspond to combinations of generable Sand L values.

In case of separately transmitting the S value, a maximum S value is 19,such that 5 bits are needed to indicate this S value ‘19’ (where0≦19<2⁵). In case of separately transmitting the L value, a maximum Lvalue is 20, such that 5 bits are needed to indicate this L value ‘20’(where 0≦20<2⁵). Therefore, in case of transmitting the S and L valuesindependent of each other, 10 bits are needed in the end. However, theRIVs are in the range of 0≦RIV≦209<2⁸, such that 8 bits are needed toindicate these RIVs, as denoted by N_(bit) _(—) _(required)=8. As aresult, it can be recognized that 2 bits are saved as compared to theabove case of transmitting the S and L values independent of each other.In this case, a valid RIV is 209 and a maximum value capable of beingindicated by 8 bits is 255, so that a total of 46 values of 210˜255 arenot actually used.

When using the conventional RIV table shown in FIG. 16, RIVs undefinedin this RIV table become invalid for an LTE terminal. For example, RIVsfrom 210 to 255 in FIG. 16 become invalid for a conventional LTEterminal. Therefore, RIVs defined in the conventional RIV table arereferred to as valid RIVs, and other RIVs undefined in this RIV tableare referred to as invalid RIVs. For example, in FIG. 16, RIVs from 0 to209 are valid RIVs, and RIVs from 210 to 255 are invalid RIVs.

Valid RIVs are able to indicate only allocation status information ofRBs defined in the table of FIG. 16, and invalid RIVs are able toindicate allocation status information of other RBs undefined in thetable of FIG. 16. In order to use invalid RIVs as described above, theassumption of the presence of invalid RIVs is needed. If the followingequation 2 is satisfied, this means that RIVs that are not used asactual values while being capable of being transferred are alwayspresent.

N≠M, where, N=┌log₂(N _(RB)(N _(RB)+1)/2)┐, M=log₂(N _(RB)(N_(RB)+1)/2)  [Equation 2]

In Equation 2,

$\frac{N_{RB}\left( {N_{RB} + 1} \right)}{2}$

is a total number of valid RIVs when the number of resource blocks isN_(RB). In Equation, N is a minimum length of a binary number forindicating all the valid RIVs. However, if

$\frac{N_{RB}\left( {N_{RB} + 1} \right)}{2}$

is not a multiple of 2, it is impossible for M to be an integer, so thatM may be set to any non-integer value. In this case, in order toaccomplish Equation 2, the following equation 3 must be achieved.

$\begin{matrix}{2^{N} \neq \frac{N_{RB}\left( {N_{RB} + 1} \right)}{2}} & \left\lbrack {{Equation}\mspace{14mu} 3} \right\rbrack\end{matrix}$

Equation 3 can be represented by the following equation 4.

2^(N+1)≠N_(RB)(N_(RB)+1)  [Equation 4]

In conclusion, if Equation 4 is accomplished, it can be seen that theaforementioned invalid RIVs exist.

Assuming that 2^(N+1)=N_(RB)(N_(RB)+1) is achieved, (N_(RB)=2^(a)) and(N_(RB)+1=2^(b)) must be established. That is, 2^(a)+1=2^(b) must besatisfied. In this case, in order to satisfy 2^(a)+1=2^(b), ‘a’ must beset to 0 (a=0) and ‘b’ must be set to 1 (b=1). Therefore, is2^(N+1)=N_(RB)(N_(RB)+1) is achieved only in the case of N_(RB)=1.However, because 6≦N_(RB)≦110 is given in the LTE,2^(N+1)≠N_(RB)(N_(RB)+1) is achieved. Thus, in the LTE,2^(N+1)=N_(RB)(N_(RB)+1) is not achieved. Therefore, N=|log₂(N_(RB)^(UL)(N_(RB) ^(UL)+1)/2)|≠M=log₂(N_(RB) ^(UL)(N_(RB) ^(UL)+1)/2) isdemonstrated, and the LTE always includes RIVs that are not used asactual values while being capable of being transmitted. Therefore, theabove-mentioned proposed method can be used for the LTE at all times.

In the meantime, in the above-mentioned RIV construction method, if amaximum value (=L^(limit)) of allocable RBs is limited, i.e., if the Lvalue is limited to L^(limit) or less, the number of required bits maybe reduced. In FIG. 12, if L^(limit) is set to 6 (i.e., L^(limit)=6),the range of generable L values is given as 1≦L≦6, combinations havingother L values having the range of 7≦L≦20 are not in use. At this time,it can be recognized that a maximum RIV among RIVs is 114. That is, therange of generable RIVs is given as 0≦RIV≦114<2⁷, so that the number ofrequired bits is 7 as denoted by N_(bit) _(—) _(required) _(—) _(lim)=7.In this case, a valid maximum RIV is 114 and a maximum value capable ofbeing denoted by 7 bits is 127, such that a total of 13 values from 115to 127 are not actually used.

The SPS method among various scheduling methods used in the LTE systemwill hereinafter be described in detail.

Presently, in order to perform uplink SPS and/or downlink SPS, the LTEsystem firstly informs a UE of radio resource control (RRC) signalinginformation, such that the UE can recognize which subframe(s) will beused for SPS transmission/reception on the basis of the received RRCsignaling information. In other words, time resources from amongtime-frequency resources allocated for SPS is firstly designated throughRRC signaling. In order to indicate available subframes, for example, aperiod and offset of each subframe can be notified. However, because aUE is still assigned only the time resource domain through the RRCsignaling, the UE cannot not transmit/receive data using the SPS.Therefore, the UE receives a PDCCH for indicating activation, and thenallocates frequency resources according to RB allocation informationincluded in the received PDCCH, and applies the modulation and the coderate depending on modulation and coding scheme (MCS) information, suchthat the UE starts transmitting/receiving data according to period andoffset information of subframes allocated through the RRC signaling.Then, upon receiving a PDCCH for indicating deactivation from a basestation (BS), the UE stops transmitting/receiving data. In the casewhere the UE receives a PDCCH indicating either the activation or thedeactivation after stopping transmitting/receiving data, the UE restartsdata transmission/reception using the period- and offset-information ofeach subframe allocated through the RRC signaling using the RBallocation and MCS information designated in the received PDCCH. In thiscase, the PDCCH including the activation-, deactivation-, and/orreactivation indication(s) may be a PDCCH from which an SPS cell radionetwork temporary identity (C-RNTI) is detected. In other words, whileallocation of time resources is carried out through the RRC signaling,transmission/reception of actual signals can be carried out after aPDCCH indicating activation and reactivation of the SPS has beenreceived. Interruption of signal transmission/reception occurs after theUE receives a PDCCH indicating SPS deactivation.

Presently, a variety of formats have been defined as PDCCH formats inthe LTE system, for example, a format 0 for uplink, and formats 1, 1A,1B, 1C, 1D, 2, 2A, 3, and 3A for downlink have been defined as PDCCHformats in the LTE system. Necessary control information may be selectedfrom among a variety of control information according to usages of theabove PDCCH formats, and a combination of the selected controlinformation is formed, such that the necessary control information canbe transmitted in the form of such a combination. For example, necessarycontrol information may be selected from among hopping flag, RBallocation, MCS, Redundancy Version (RV), New Data Indicator (NDI),Transmission Power Control (TPC), a Cyclic Shift, Demodulation ReferenceSignal (DM RS), UL index, a Channel Quality Indicator (CQI) request, aDL allocation index, a Hybrid Automatic Repeat Request (HARQ) processnumber, a Transmitted Precoding Matrix Indicator (TPMI), and PMIconfirmation.

SPS Activation and Reactivation

Basic information such as NDI, RB allocation, MCS information, and thelike is needed for SPS activation or SPS reactivation. Each PDCCH formatincludes unnecessary information in addition to the basic information.In case of SPS deactivation, NDI, RB allocation, MCS information and thelike are no longer required, and only the deactivation statusinformation is required for the SPS deactivation.

SPS allocation and non-persistent allocation can be distinguished fromeach other according to whether a radio network temporary identity(RNTI) masked on a cyclic redundancy check (CRC) part of a PDCCH is anSPS C-RNTI or a C-RNTI. However, according to the present invention,when an SPS-based operation is performed, each of unnecessary bits amongPDCCH formats is fixed to zero ‘0’, such that this bit composed of ‘0’may be used to re-confirm SPS allocation information.

Detailed bit field structures of individual PDCCH formats during the SPSoperation according to the present invention can be given as thefollowing tables 2 to 5.

TABLE 2 Format 0/1A 1 bit → Format 0 indicator ‘0’ Hopping Flag 1 bitResource Block N bit Allocation MCS 5 bits → First MSB ‘0’: SPSValidation ‘0xxxx’ NDI 1 bit DM-RS 3 bits → ‘000’→ SPS Validation ‘000’TPC (PUSCH) 2 bits → ‘00’→ SPS Validation ‘00’ CQI trigger 1 bit ULindex (TDD) (2 bits)

Table 2 shows the ‘format 0’ for uplink, if it is assumed that all orsome of the MCS, DM-RS, and TPC bit fields are set to zero ‘0’ as shownin Table 2, the UE is able to confirm that the SPS C-RNTI is masked onthe CRC part of a PDCCH, i.e., the UE is able to confirm SPS validation.

TABLE 3 Format 0/1A 1 bit → Format 1A indicator ‘1’ LVRB/DVRB 1 bit FlagResource Block N bit Allocation MCS 5 bits → First MSB ‘0’: SPSValidation ‘0xxxx’ NDI 1 bit HARQ index 3 bits → 000’→ SPS Validation‘000’ TPC (PUCCH) 2 bits RV 2 bits → ‘00’→ SPS Validation ‘00’ DL index(TDD) (2 bits)

Table 3 shows the format 1A for a Single Input Multi Output (SIMO)downlink compact scheme. As shown in Table 3, if it is assumed that allor some of the MCS, HARQ index, and RV bit fields are set to zero ‘0’ asshown in Table 3, the UE is able to confirm that the SPS C-RNTI ismasked on the CRC part of a PDCCH.

TABLE 4 Allocation type 1 bit Flag Resource Block P bit Allocation MCS 5bits → First MSB ‘0’: SPS ‘0xxxx’ Validation HARQ index 3 bits (4-bit‘000(0)’→ SPS Validation TDD) → ‘000(0)’ NDI 1 bit RV 2 bits → ‘00’→ SPSValidation ‘00’ TPC (PUCCH) 2 bits DL index (TDD) 2 bits

Table 4 shows the format 1 for a Single Input Multi Output (SIMO)downlink scheme. As shown in Table 4, if it is assumed that all or someof the MCS, HARQ index, and RV bit fields are set to zero ‘0’ as shownin Table 4, the UE is able to confirm that the SPS C-RNTI is masked onthe CRC part of a PDCCH.

TABLE 5 Allocation type 1 bit Flag Resource Block P bits Allocation TPC(PUCCH) 2 bits DL index (TDD) 2 bits HARQ index 3 bits (4-bit ‘000(0)’→SPS Validation TDD) → ‘000(0)’ HARQ swap flag 1 bit MCS 1 5 bits → FirstMSB ‘0’: SPS ‘0xxxx’ Validation NDI 1 1 bit RV 1 2 bits → ‘00’→ SPSValidation ‘00’ MCS 2 5 bits → First MSB ‘0’: SPS ‘0xxxx’ Validation NDI2 1 bit RV 2 2 bits → ‘00’→ SPS Validation ‘00’ Precoding 3 or 6 bits

Table 5 shows the ‘format 2/2A’ for a closed-loop/open-loop SpatialMultiplexing (SM). As shown in Table 5, if it is assumed that all orsome of the MCS, HARQ index, and RV bit fields are set to zero ‘0’ asshown in Table 5, the UE is able to confirm that the SPS C-RNTI ismasked on the CRC part of a PDCCH.

SPS Deactivation

The SPS deactivation method according to the present invention willhereinafter be described in detail.

The compact resource allocation method is used in the formats 0, 1A, 1B,1C, and 1D among the above-mentioned PDCCH formats. In this case, whensome of RIVs are valid RIVs and the other RIVs are invalid RIVs, theinvalid RIVs may be used for an event requesting no RB allocation.

In the present invention, when a downlink control signal format based onthe compact-type RB allocation scheme is used for signaling SPSactivation and/or SPS deactivation, an RIV contained in the PDCCH fromwhich the SPS C-RNTI is detected may be used as signaling informationfor SPS deactivation indication. In this case, the RIV contained in thePDCCH from which the SPS C-RNTI is detected may have any one of valuescapable of being used as the above-mentioned invalid RIVs.

For example, according to the RIV construction method shown in Table 1,a valid RIV indicating a generable RB allocation combination may be anyone of RIVs from 0 to 209 (where this RIV ‘209’ is a maximum valid RIV).In this case, an invalid RIV may be any one of RIVs from 210 to 255. Ifthe RIV detected from the PDCCH from which the SPS C-RNTI is detectedbelongs to the invalid RIV, the UE recognizes that signaling informationindicating SPS deactivation is transmitted. A maximum value capable ofbeing indicated by a binary field indicating each RIV is certainlyincluded in values capable of belonging to the invalid RIV. That is, theabove-mentioned invalid RIV certainly includes a specific value acquiredwhen the entire binary field indicating each RIV is filled with ‘1’.Specifically, in the case where the RIV detected in the PDCCH from whichthe SPS C-RNTI was detected is determined to be the above specific valueacquired when the entirety of the binary field is filled with ‘1’, itcan be recognized that signaling information indicating SPS deactivationis transmitted on the basis of the above specific value.

FIG. 17 shows an exemplary structure of a PDCCH field for signaling SPSdeactivation according to the present invention. As shown in FIG. 17, ifthe RIV binary field is composed of 8 bits, a binary number RIV(=11111111₂) is acquired. If the RIV (=11111111₂) is detected, this RIV(=11111111₂) may indicate that signaling information indicating SPSdeactivation was transmitted.

A method for indicating SPS deactivation when DVRB allocation is carriedout in a PDCCH having a DCI format 1A will hereinafter be described indetail.

FIG. 18 shows individual fields acquired when DVRB allocation is carriedout in a PDCCH having a DCI format 1A according to the presentinvention. FIG. 18( a) shows an exemplary case in which an LVRB is used.FIGS. 18( b) and 18(c) illustrate exemplary cases, each of which showsthe use of a DVRB. In more detail, FIG. 18( b) shows the use of ‘Gap1’and FIG. 18( c) shows the use of ‘Gap2’.

When using a DVRB as shown in FIGS. 18( b) and 18(c), one bit 1802 fromamong the entire bits 1801 used as an RIV field indicating LVRBallocation information as shown in FIG. 18( a) is used for indicating‘Gap1’/‘Gap2’. Only the remaining bit field 1803 is allocated as an RIVfield. In this case, as shown in FIG. 18, the maximum allocable numberof RBs is limited to 16 so that the RIV does not exceed the maximumvalue which can be represented by the RIV field which is reduced by theone bit 1802.

At least one invalid RIV unused for allocating valid resources exists,and this invalid RIV may be used as signaling information indicating SPSdeactivation. Specifically, if the invalid RIV exists, the maximum valuecapable of being indicated by the binary field indicating an RIV isincluded in the existing invalid RIV, so that this maximum value can beused for deactivation. In other words, the value acquired when theentirety of the RIV binary field is filled with ‘1’ may be used fordeactivation. As can be seen from FIG. 18, there may arise two casesaccording to indication 1802 of the ‘Gap’. The SPS deactivationconstruction having ‘Gap2’ shown in FIG. 18( c) has the same bit patternas that of FIG. 18( a) in which the RIV field for LVRB is configured toindicate the SPS deactivation.

In addition, in case of the SPS deactivation, a distinction between‘Gap1’ and ‘Gap2’ and a distinction between LVRBs and DVRBs aremeaningless. Therefore, even for a SPS UE which is using ‘Gap1’ shown inFIG. 18( b), the entire RIV field for LVRB can be filled out with ‘1’ inorder to represent SPS deactivation. In other words, although ‘Gap1’ iscurrently used as shown in FIG. 18( b), the ‘Gap’ indication field 1802may be filled with ‘1’ instead of ‘0’ under the SPS deactivation.

Hereinafter, a method for indicating SPS deactivation when hopping isused for the PDCCH having the ‘DCI format 0’ according to the presentinvention will hereinafter be described.

FIG. 19 shows individual fields of a PDCCH having a ‘DCI format 0’according to the present invention. FIG. 19( a) shows an exemplary casein which the hopping is not used. FIGS. 19( b) and 19(c) show othercases in which the hopping is used when a system band is in the rangefrom 50 RBs to 110 RBs.

In the case where the system band is in the range from 50 RBs to 110 RBsas shown in FIGS. 19( b) and 19(c) and hopping is carried out, 2 bits1902 from among all bits 1901 used as an RIV field indicating VRBallocation information are used to indicate hopping information. Onlythe remaining bits 1903 are allocated as an RIV field. If it is assumedthat the hopping is carried out in the format 0 and the system bandwidthis in the range from 6 RBs to 49 RBs, one bit (1 bit) from among allbits used as the VRB RIV field is used to indicate the hoppinginformation.

For example, as shown in FIGS. 19( b) and 19(c), the length of RBscapable of being maximally allocated is limited, such that an RIV doesnot exceed a maximum value capable of being indicated by the RIV field1903. Even in the case, there exists at least one invalid RIV to beunused, and this invalid RIV may be used for SPS deactivation. Theinvalid RIV includes the maximum value capable of being indicated by abinary field through which the RIV will be transferred, such that thismaximum value can be used for deactivation. There may arise two casesaccording to the hopping information as shown in FIG. 19. The SPSdeactivation construction formed when each bit indicating the hoppinginformation is set to ‘1’ as shown in FIG. 19( c) has the same bitpattern as that of FIG. 19( a) in which the RIV field for VRB isconfigured to indicate the SPS deactivation.

In addition, as described above, the distinction based on hoppinginformation is meaningless for the SPS deactivation. Therefore, evenwhen a hopping is performed as like in FIG. 19( b) or 19(c), the entireRIV field 1901 can be filled with ‘1’ to indicate SPS deactivation.

As described above, because it is enough to inform only the deactivationstatus without other control information to indicate a SPS deactivation,it is preferable that only one format be used for each of uplink anddownlink. In other words, the format 0 may be used in uplink and theshortest format 1A may be used in downlink.

Tables 6 and 7 show examples of detailed field structures used whenuplink SPS deactivation and downlink SPS deactivation are signaled by‘DCI format 0’ and ‘DCI format 1A’, respectively.

TABLE 6 Format 0/1A 1 bit → ‘0’ Format 0 indicator Hopping Flag 1 bit →‘x’ Resource Block N bit→ ‘11 . . . 11’ SPS deactivation Allocation MCS5 bits → First MSB ‘0’: SPS ‘0xxxx’ Validation NDI 1 bit → ‘x’ DM-RS 3bits → ‘000’→ SPS Validation ‘000’ TPC (PUSCH) 2 bits → 00’→ SPSValidation ‘00’ CQI trigger 1 bit → ‘x’ UL index (TDD) (2 bits) → ‘xx’

Table 6 shows a PDCCH having a ‘DCI format 0’ for uplink. When a UEconfirms that the SPS C-RNTI is masked on a CRC part of the PDCCH andthat all or some of the MCS, DM-RS, and TPC bit fields are set to zero‘0’ as shown in Table 6, the UE is able to recognize that SPS isactivated. In addition, a SPS deactivation can be signaled by settingthe whole RIV field to ‘1’ as described above. Because the bits in table6, each of which is denoted by ‘x’, are irrelevant to SPS validation andSPS deactivation, an arbitrary value may be assigned to each of thebits. However, if all of the bits is fixed to ‘0’ or ‘1’, the UE mayadditionally confirm that the SPS is deactivated.

TABLE 7 Format 0/1A 1 bit → ‘1’ Format 1A indicator LVRB/DVRB 1 bit →‘x’ Flag Resource Block N bit SPS deactivation Allocation → ‘11 . . .11’ MCS 5 bits → First MSB ‘0’: SPS ‘0xxxx’ Validation NDI 1 bit → ‘x’HARQ index 3 bits → ‘000’→ SPS Validation ‘000’ TPC (PUCCH) 2 bits → ‘x’RV 2 bits → ‘00’→ SPS Validation ‘00’ DL index (TDD) (2 bits) → ‘xx’

Table 7 shows a PDCCH having a ‘DCI format 1A’ for downlink. When a UEconfirms that the SPS C-RNTI is masked on a CRC part of the PDCCH andthat all or some of the MCS, HARQ index, and RV bit fields are set tozero ‘0’ as shown in Table 7, the UE is able to recognize that SPS isactivated. In addition, the SPS deactivation can be signaled by settingthe entire RIV field to ‘1’ as described above. Because the bits intable 7, each of which is denoted by ‘x’, are irrelevant to either SPSvalidation or SPS deactivation, an arbitrary value may be assigned toeach of the bits. However, if all of the bits is fixed to ‘0’ or ‘1’,the UE may additionally confirm that the SPS is deactivated.

FIG. 20 is a block diagram illustrating constituent elements of a device50 applicable to the present invention.

In FIG. 20, the device 50 may be a UE or a base station (BS). Inaddition, the above-mentioned methods can be implemented by this device50. The device 50 includes a processor 51, a memory 52, a RadioFrequency (RF) unit 53, a display unit 54, and a user interface unit 55.Layers of the radio interface protocol are realized in the processor 51.The processor 51 provides a control plane and a user plane. Functions ofindividual layers can be implemented in the processor 51. The processor51 may include a contention resolution timer. The memory 52 is connectedto the processor 51 and stores an operating system, applications, andgeneral files. If the device 50 is a UE, the display unit 54 displaysvarious information, and may use well-known elements such as a LiquidCrystal Display (LCD), an Organic Light Emitting Diode (PLED), and thelike. The user interface unit 55 may be constructed of a combination ofwell-known user interfaces such as a keypad, a touch screen, and thelike. The RF unit 53 is connected to the processor 51 so that it cantransmit and receive RF signals to and from the processor 51.

Embodiment 1

A method and apparatus for allowing the UE 50 shown in FIG. 20 toperform SPS deactivation according to a first embodiment of the presentinvention will hereinafter be described in detail.

The first embodiment of the present invention relates to a method andapparatus for deactivating semi-persistent scheduling (SPS) by the UE 50of FIG. 20. The processor 51 contained in the UE 50 receives a downlinkcontrol channel from a base station (BS) through the RF unit 53. If thebinary field indicating resource allocation information contained in thedownlink control channel is entirely filled with ‘1’, the processor 51deactivates the SPS.

Embodiment 2

A method and apparatus for allowing the base station (BS) 50 shown inFIG. 20 to transmit a signal for SPS deactivation according to a secondembodiment of the present invention will hereinafter be described indetail.

The second embodiment of the present invention relates to a method andapparatus for transmitting a signal for SPS deactivation by the basestation (BS) 50 shown in FIG. 20. When performing the SPS deactivation,the processor 51 of the base station (BS) 50 fills the entire binaryfield indicating resource allocation information contained in a downlinkcontrol channel with the value of ‘1’. Thereafter, the processor 51transmits the downlink control channel through the RF unit 53. In thiscase, the binary field filled with the value of ‘1’ indicates SPSdeactivation.

It is apparent to those skilled in the art that the first embodiment(Embodiment 1) and the second embodiment (Embodiment 2) can bereconstructed as a method invention embodied by a combination of stepsexecuted in the RF unit and the processor.

Embodiment 3

FIG. 21 is a flowchart illustrating a method for deactivating asemi-persistent scheduling (SPS) according to the present invention.

In order to perform SPS deactivation, a base station (BS) fills theentire binary field indicating resource allocation information containedin a downlink control channel with the value of ‘1’ at step S2101. Thebase station (BS) transmits the downlink control channel to the UE atstep S2102. The UE receives the downlink control channel from the basestation (BS) at step S2103. When the entire binary field indicatingresource allocation information contained in the downlink controlchannel is filled with ‘1’, the UE performs the SPS deactivation.

The first to third embodiments (Embodiment 1˜Embodiment 3) can berestricted as follows. The downlink control channel may be a PDCCH, anda Downlink Control Information (DCI) format of the downlink controlchannel may be a ‘Format 0’ or a ‘Format 1A’. The wireless mobilecommunication system uses a scheduling method based on the compactscheme, and the binary field may be composed of a field indicating anRIV. Otherwise, the above-mentioned binary field may be composed of afield indicating an RIV and a field indicating ‘Gap’ information usedfor distributed allocation of resources. For another example, theabove-mentioned binary field may be composed of a field indicating anRIV and a field indicating hopping information.

The present invention uses a Resource Indication Value (RIV) not mappedfor RB allocation in a Physical Downlink Control Channel (PDCCH) so asto indicate an SPS deactivation status, so that it can inform a UE ofSPS deactivation without adding a bit field or a new format.

Although the present invention has been disclosed by referring to theabove-mentioned embodiments, it should be noted that the aforementionedembodiments have been disclosed only for illustrative purposes, andthose skilled in the art will appreciate that various modifications,additions and substitutions are possible, without departing from thescope and spirit of the invention as disclosed in the accompanyingclaims. Thus, it is intended that the present invention covers themodifications and variations of this invention provided they come withinthe scope of the appended claims and their equivalents. Therefore, thepresent invention is not limited to the above-mentioned embodiments, butcan be applied to other examples which can satisfy the above principlesand new characteristics of the present invention.

As apparent from the above description, the present invention isapplicable to a transmitter and a receiver for use in a communicationsystem.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A method for deactivating semi-persistent scheduling (SPS) in awireless mobile communication system, the method comprising: receiving,by a user equipment (UE), a downlink control channel related to adeactivation of the SPS; and deactivating, by the UE, the SPS after thedownlink control channel is received, including releasing of a downlinkassignment or an uplink grant, wherein the downlink control channelcomprises a first binary field related to resource allocation, the firstbinary field being entirely filled with ‘1’, a second binary fieldrelated to hybrid automatic repeat request (HARQ) process number, thesecond binary field being entirely filled with ‘0’, and a third binaryfield related to redundancy version (RV), the third binary field beingentirely filled with ‘0’.
 2. The method according to claim 1, whereinthe downlink control channel is a physical downlink control channel(PDCCH).
 3. The method according to claim 1, wherein a downlink controlinformation (DCI) format of the downlink control channel is a ‘format1A’.
 4. The method according to claim 1, wherein the wireless mobilecommunication system performs scheduling based on a compact scheme, andwherein the first binary field is composed of a field indicating aresource indication value (RIV).
 5. The method according to claim 1,wherein the wireless mobile communication system performs schedulingbased on a compact scheme, and wherein the first binary field iscomposed of a field indicating a resource indication value (RIV) and afield indicating ‘Gap’ information that is used for distributedallocation of resources.
 6. The method according to claim 1, wherein thewireless mobile communication system performs scheduling based on acompact scheme, and wherein the first binary field is composed of afield indicating a resource indication value (RIV) and a fieldindicating hopping information.
 7. A method for transmitting a signalfor semi-persistent scheduling (SPS) deactivation in a wireless mobilecommunication system, the method comprising: filling, by a base station(BS), a first binary field related to resource allocation in a downlinkcontrol channel entirely with ‘1’; filling, by the BS, a second binaryfield related to hybrid automatic repeat request (HARQ) process numberin the downlink control channel entirely with ‘0’; filling, by the BS, athird binary field related to redundancy version (RV) in the downlinkcontrol channel entirely with ‘0’; and transmitting the downlink controlchannel to a user equipment (UE) for deactivation of the SPS, whereinthe deactivation of the SPS includes a release of a downlink assignmentor an uplink grant.
 8. The method according to claim 7, wherein thedownlink control channel is a physical downlink control channel (PDCCH).9. The method according to claim 7, wherein a downlink controlinformation (DCI) format of the downlink control channel is a ‘format1A’.
 10. The method according to claim 7, wherein the wireless mobilecommunication system performs scheduling based on a compact scheme, andwherein the first binary field is composed of a field indicating aresource indication value (RIV).
 11. The method according to claim 7,wherein the wireless mobile communication system performs schedulingbased on a compact scheme, and wherein the first binary field iscomposed of a field indicating a resource indication value (RIV) and afield indicating ‘Gap’ information that is used for distributedallocation of resources.
 12. The method according to claim 7, whereinthe wireless mobile communication system performs scheduling based on acompact scheme, and wherein the first binary field is composed of afield indicating a resource indication value (RIV) and a fieldindicating hopping information.
 13. A user equipment (UE) for a wirelessmobile communication system, the UE comprising: a radio frequency (RF)unit; and a processor electrically connected to the RF unit, wherein theprocessor is configured to receive a downlink control channel related todeactivation of a semi-persistent scheduling (SPS) through the RF unit,and deactivate the SPS after the downlink control channel is received,including releasing of a downlink assignment or an uplink grant, andwherein the downlink control channel comprises a first binary fieldrelated to resource allocation, the first binary field being entirelyfilled with ‘1’, a second binary field related to hybrid automaticrepeat request (HARQ) process number, the second binary field beingentirely filled with ‘0’, and a third binary field related to redundancyversion (RV), the third binary field being entirely filled with ‘0’. 14.The UE according to claim 13, wherein the downlink control channel is aphysical downlink control channel (PDCCH).
 15. The UE according to claim13, wherein a downlink control information (DCI) format of the downlinkcontrol channel is a ‘format 1A’.
 16. The UE according to claim 13,wherein the wireless mobile communication system performs schedulingbased on a compact scheme, and wherein the first binary field iscomposed of a field indicating a resource indication value (RIV). 17.The UE according to claim 13, wherein the wireless mobile communicationsystem performs scheduling based on a compact scheme, and wherein thefirst binary field is composed of a field indicating a resourceindication value (RIV) and a field indicating ‘Gap’ information that isused for distributed allocation of resources.
 18. The UE according toclaim 13, wherein the wireless mobile communication system performsscheduling based on a compact scheme, and wherein the first binary fieldis composed of a field indicating a resource indication value (RIV) anda field indicating hopping information.
 19. A wireless communicationapparatus, comprising: a radio frequency (RF) unit; and a processorelectrically connected to the RF unit, wherein the processor isconfigured to fill a first binary field related to resource allocationin a downlink control channel entirely with ‘1’, fill a second binaryfield related to hybrid automatic repeat request (HARQ) process numberin the downlink control channel entirely with ‘0’, fill a third binaryfield related to redundancy version (RV) in the downlink control channelentirely with ‘0’, and transmit the downlink control channel to a userequipment (UE) for deactivation of a semi-persistent scheduling (SPS),wherein the deactivation of the SPS includes a release of a downlinkassignment or an uplink grant.
 20. The wireless communication apparatusaccording to claim 19, wherein the downlink control channel is aphysical downlink control channel (PDCCH).
 21. The wirelesscommunication apparatus according to claim 19, wherein a downlinkcontrol information (DCI) format of the downlink control channel is a‘format 1A’.
 22. The wireless communication apparatus according to claim19, wherein a scheduling based on a compact scheme is performed, andwherein the first binary field is composed of a field indicating aresource indication value (RIV).
 23. The wireless communicationapparatus according to claim 19, wherein a scheduling based on a compactscheme is performed, and wherein the first binary field is composed of afield indicating a resource indication value (RIV) and a fieldindicating ‘Gap’ information that is used for distributed allocation ofresources.
 24. The wireless communication apparatus according to claim19, wherein a scheduling based on a compact scheme is performed, andwherein the first binary field is composed of a field indicating aresource indication value (RIV) and a field indicating hoppinginformation.